June 2023 1 13 Report
Знайдіть масові частки кожного елемента в хімічній формуле С2Н4 (Ar C=12.) ArH= 1)СРОЧНО ПОМОГИТЕ ОСТАЛОСЬ 5 МИНУТ!!!ДАЮ 25 БАЛЛОВ!! 5-9 КЛАССЫ!!!!​
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